chore: enforce experimental in e2e tests

[robert-zaremba]

Description

[codecov]

Codecov Report

Merging #2253 (13921f2) into main (7f05ad4) will decrease coverage by 5.05%.
Report is 232 commits behind head on main.
The diff coverage is 84.48%.

@@            Coverage Diff             @@
##             main    #2253      +/-   ##
==========================================
- Coverage   75.38%   70.34%   -5.05%     
==========================================
  Files         100      168      +68     
  Lines        8025    12647    +4622     
==========================================
+ Hits         6050     8896    +2846     
- Misses       1589     3154    +1565     
- Partials      386      597     +211     

Files Changed	Coverage Δ
ante/spam_prevention.go	75.92% <ø> (ø)
cmd/ibc_denom/main.go	0.00% <0.00%> (ø)
util/coin/coin.go	12.50% <0.00%> (ø)
util/sdkutil/msg.go	0.00% <0.00%> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/keeper/genesis.go	40.90% <ø> (ø)
x/incentive/keeper/grpc_query.go	59.18% <ø> (ø)
x/incentive/keeper/hooks.go	50.00% <ø> (ø)
x/incentive/keeper/invariants.go	0.00% <ø> (ø)
x/incentive/keeper/iter.go	84.90% <ø> (ø)
... and 51 more

... and 85 files with indirect coverage changes